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Lynna [10]
3 years ago
12

Which substance has a melting point greater than room temperature

Chemistry
1 answer:
yarga [219]3 years ago
7 0
The answer is b because Heating water makes it evaporate faster
Adding salt makes it boil at a higher temperature
Increasing the pressure would force the water from the air back into the beaker
Increasing the humidity means there are more molecules in the air, increasing the chance that our water
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Differenciate between adsorption and absorption.<br><img src="https://tex.z-dn.net/?f=%20%5C%5C%20" id="TexFormula1" title=" \\
blagie [28]

Answer:

Adsorption is the adhesion of a liquid or gas on the surface of a solid material, forming a thin film on the surface While Absorption is the process of being swallowed up or by being absorbed

4 0
2 years ago
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A family ppoo holds 10000 gallons of water. how many cubic meters is this
yKpoI14uk [10]

10000 gallons= 37.85 cubic feet

7 0
3 years ago
The zero order reaction 2N2O→2N2+O2 has the reaction constant k is 6.28×10−3 molL s. If the initial concentration of N2O is 0.96
Talja [164]

<u>Answer:</u> The concentration of N_2O in three significant figures will be 0.899 mol/L.

<u>Explanation:</u>

For the given reaction:

2N_2O\rightarrow 2N_2+O_2

The above reaction follows zero order kinetics. The rate law equation for zero order follows:

k=\frac{1}{t}([A_o]-[A])

where,

k = rate constant for the reaction = 6.28\times 10^{-3}\text{ mol }L^{-1}s^{-1}

t = time taken = 10 sec

[A_o] = initial concentration of the reactant = 0.962 mol/L

[A] = concentration of reactant after some time = ?

Putting values in above equation, we get:

6.28\times 10^{-3}=\frac{1}{10}(0.962-[A])

[A]=0.899mol/L

Hence, the concentration of N_2O in three significant figures will be 0.899 mol/L.

5 0
3 years ago
Calcium nitrate reacts with sodium phosphate to form sodium nitrate and calcium phosphate. Given 96.1 grams of calcium nitrate w
Bingel [31]
Equation is:

Ca(NO3)2 + Na3PO4 —> NaNO3 + Ca3(PO4)2

Balance it out

3Ca(NO3)2 + 2Na3PO4 —> 6NaNO3 + Ca3(PO4)2

You have 96.1g of Calcium Nitrate

Moles = Mass/Molar Mass

Molar mass of Calcium Nitrate is 164.088 g/mol

96.1g / 164.088 g/mol =0.586 moles

Mole ratio is 3:1

Therefore 0.586/3 moles of calcium phosphate

Moles x molar mass = mass

0.586/3 x 310.18 g/mol = 60.6~g roughly as theoretical yield
5 0
4 years ago
Suppose that the uncertainty in determining the position of an electron circling an atom in an orbit is 0.4 A. What is the uncer
dolphi86 [110]

Answer:

Explanation:

Applying the Heisenberg uncertainty principle,

Δx X mΔv = h/4π

where Δx = uncertainty in measurement of position

Δv = uncertainty in measurement of velocity

m = mass of object

h = planck's constant

Here:

Δv = 0.4 A° = 4.0 x 10^-11 m

mass, m = 9.11 x 10^-31 Kg

Plugging the values,

4.0 x 10^-11 x Δ v = (6.626 x 10^-34) / (4 x 3.14 x 9.11E-31)

4.0 x 10^-11 x Δ v = 5.791 x 10^-5

Δv = 1.448 x 10^6 m/s, the uncertainty in its velocity

Answer = 1.45 x 10^6 m/s

3 0
3 years ago
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